| 초록 |
Rimming flow of highly viscous fluid partially filled in a horizontally rotating cylinder shows various patterns depending on inertia, gravity, viscosity and surface tension. In this study we performed experimental and computational study on the effects of process parameters such as rotating speed of cylinder, fluid property and fluid filling fraction on the patterns of rimming flow. We used silicone oil and Boger fluid (1wt % PAAm solution in Ethylene Glycol+Glycerin mixture) as Newtonian and non-Newtonian fluid, respectively. We observed and classified two distinct states, homogenous film and bump state, by modified Jeffreys number which is proportional to the viscosity and rotating speed and inversely proportional to the fluid filling fraction. In computational study, Giesekus model and DEVSS/SUPG method are used for viscoelastic flow simulation. It is shown that the computational results in cross sectional 2-D simulation are close agreement with those obtained experimentally. |
